This is a full rewrite of our nn_boss (SpotPass) implementation. The previous code was based on a lot of incorrect guesswork so rather than updating that it made more sense to redo it all.
In short what changed:
- More API implemented than before, but nn_boss is very complex so we are still missing stuff (e.g. PlayReports and Task scheduling)
- Avoids redownloading nbdl files if they are already present locally (matches IOSU behavior)
- The API should be more robust in general and file hashes are now verified
- Emulated IOSU interface is compatible with nn_boss.rpl
- Added an UI option to clear the SpotPass cache
- Full reimplementation of proc_ui.rpl with all 19 exports
- Foreground/Background messages now go to the coreinit system message queue as they should (instead of using a hack where proc_ui receives them directly)
- Add missing coreinit API needed by proc_ui: OSGetPFID(), OSGetUPID(), OSGetTitleID(), __OSCreateThreadType()
- Use big-endian types in OSMessage
- Flesh out the stubs for OSDriver_Register and OSDriver_Unregister a bit more since we need to call it from proc_ui. Similiar small tweaks to other coreinit API
- Stub sysapp SYSSwitchToEManual() and _SYSSwitchToEManual() in such a way that they will trigger the expected background/foreground transition, avoiding softlocks in games that call these functions
